It's a heave-ho, U.S. Navy style. After several years during which turning old warships into artificial reefs was fashionable, four decommissioned aircraft carriers will instead be dismantled, and recycled, at shipyards.

As part of NBCUniversal's Earth Week programming April 17-24, "Green is Universal" has put together tips for recycling material you might otherwise throw out.

An environmental group that's been championing the shift said it makes sense: creating shipyard jobs in the U.S., instead of a potential toxic mess at sea.

"The Obama administration's new plan to recycle these four aircraft carriers appears to be a signal that the administration may be correcting long-standing misguided policies that not only squander resources, but American jobs as well," stated Colby Self of the Basel Action Network, a group that monitors global toxic issues and that last December issued a report critical of the artificial reefs.

"With a strong metal market, these recoverable metals could bring a return of up to $30 million," Self told msnbc.com. "After accounting for the ship purchase price by competitive bid, towing, environmental remediation of toxic materials and labor rates, the recycling of this vessel should be a profitable venture for the domestic ship recycling industry and should give the local economy a great boost."

Dozens of other warships have previously been dumped at sea or turned into reefs after efforts were made to remove toxic material.

BAN said that the environmental work on two recent aircraft carriers to meet that fate — the America and the Oriskany — cost more than $20 million each and that not all contaminants were removed.